Diesel monkey



Patented July 23,

PATENT OFFICE DIESEL MONKEY Paul Pfeifier, Altona, Germany Application August 6, 1937, Serial No. 151,805 Germany August 7, 1936 suggestion has also already been made to equip Diesel rams with a cylinder and movable stage piston resting on the striking plate, the striking pin passing through the bottom of the cylinder and the injection chamber being formed between the latter and the piston;

The present invention contemplates a further development of a Diesel ram with a stage piston and does away with thedisadvantages that were hitherto connected with such differential rams.

With the above in view an object of my inven- 18 tion is to provide an improved diiferential explosion ram. Other objects and advantages reside in the particular structure of the apparatus, combination and arrangement of the several parts and in the particular mode of operation- 80 all of which will be readily apparent to those skilled in the art upon reference to the-drawing in connection with the detailed description to follow.

In the drawing: 25, Fig. 1 is a vertical section of the contrivance with the ram in its lowermost position;

Fig. 2 is a similar view of the same, but'taken at a different angle and shows the ram in its highest position; a g

Fig. 3 is a similar view of the contrivance and shows the ram in an intermediate position; and

Fig. 4 is an elevation of an alternative form of ram.

With particular reference to Figs. 1-3, it is 35 apparent that the ram of the invention comprises alined upper and lower cylinders II and I0 respectively in which a ram I is slidably mounted for reciprocatory movement. The upper cylinder II is of a larger bore than the lower 0 cylinder l0 and is provided with lateral exhaust ports 4 in its side walls. A fuel injection nozzle 13 is provided in a side wall of the cylinder H adjacent the bottom'thereof.

The upper end 20 of the piston l is enlarged to fit in the cylinder II and carries the usual piston rings 2| to insure a tight fit therein. The

shoulder 23 of the piston head 20. The abutting ends of. the cylinders H and 49 may be connected together in any suitable manner, as by the lapped portions 24, 24 respectively thereof.

, The lower cylinder III has a bore corresponding to the diameter of the stem IQ of the piston l. The upper end of the cylinder I0 is annularly Q0 recessed as at 28 to seat packing rings II which seal the explosion chamber 2 from the cylinder It.

The outside of the cylinder l0, adjacent the lower end thereof, is formed to provide a pump lever chamber 5 in which is pivotally mounted a bell-crank lever 9, having arms 9 and 9 opening la in the wall of the cylinder Ill connects the lever chamber 5 with the interior of the cylinder I0. An upper portion of the chamber 5 mounts a fuel injection pump 5 having a depending stem I6 Fuel is supplied to the pump IS in any suitable manner (not shown). The pump supplies fuel to the injection nozzle II in .any suitable manner, as by the conduits 30, 3|. The arm- 9 of the bell crank lever 9 extends slightly intothe interior of the cylinder Hi and is adapted to be engaged by a cam surface It on the stem I9 of the piston l adjacent the lower end thereof. The arm 9 of the lever 9 is adapted to engage the stem it of the pump l6 ,to force fuel to the nozzle l3.

The stem is is provided with a plurality of The chamber 5 is provided with an air intake v valve 1 anda spring loaded air outletvalve 8.

The lower end ofthe cylinder iii mounts any suitable striking plate l2 against which abuts a suitable striking pin 6 which is fitted in the open lower end of the'cylinder Ill.

The device operates on the Diesel principle and combustion in the expansible firing chamber is achieved by the heat of compression. The operation is as follows:

With the parts in the position of Fig. 2, the piston i descends by gravity. Air has been sucked into the chamber I0 through valves 1 and grooves 3.- As soon as the ascending piston reaches the' position of Fig. 3, the exhaust ports 4 are uncovered to permit the escape of the exhaust gases. Thereafter, during ascent, the

rooves 3. enter the combustion chamber 2 to break the suction of stem I and no more air is then drawn into chamber l0. However, as the piston descends, air in chamber i0 is forcedthrough combustion chamber 2 via the grooves 3 and exhaust ports 4 to flush the chamber 2. At the descending Fig, 3 position, the grooves 3 are cut-ofi and no more air is forced into chamber 2. The balance of theair in chamber i0 is forced out through valve ll. Justafter the piston l'descends below the position of Fig. 3, the exhaust ports 4 and grooves 3 are sealed off from the combustion chamber 2, thereby trapping air in the combustion chamber between the shoulder 23 of head and the floor 21.

This air, as aforesaid, has been forced into the combustion chamber 2 through grooves 3 during the previous descent of the ram I. Some of this air serves to flush the combustion chamber through the exhaust ports 4.. The air exhaust valve 8 is spring loaded to an extent to prevent the escape of air therethrough until the pressure.

in cylinder I0 is increased bythe sealing off of the grooves 3 from the chamber 2. Continued descent compresses the air in chamber 2 and raises the temperature thereof to the ignition point of the fuel.

When the cam I l of the descending stem l9 engages the lever arm 9, it swings the lever 9 on its pivot while the lever arm 9* actuates the stem l6 of the pump IE to force fuel through the nozzle l3 into the combustion chamber 2. Any unused air trapped below the stem I9 is expelled through the air exhaust valve as aforesaid.

The heat of the compressed air ignites the injected fuel and the resultant explosion raises the piston I. The products of combustion are exhausted through the ports 4. At the same time a supply of fresh air is sucked in through the intake valve. 1. A

Meanwhile, at the bottom of the stroke the lower end of the stem l9 has struck the striking pin 6 which in turn hastransmitted the blow to the work (not shown) via the striking plate l2.

In the modification of Fig. 4, a modified piston 25 isshown. This piston differs from the piston I only in that instead of peripheral grooves it has air intake passages l5 formed therein. The device operates in the same manner as the preferred form.

It is to be noted that the length of the stem IS in both forms permits an extremely long stroke without permitting the stem l9 to leave the cylinder l0. Thus, both the head 20 and stem l9 are continuously guided in their respective cylinders and wobbling and. theresultant wear are eliminated.

Having thus described my invention, I claim:

1. In a Diesel monkey including fuel and air supplying means, a pair of alined vertical cylinders, one cylinder having a larger bore than the other, a ram having an enlarged head slidably mounted in the larger chamber and a reduced stem having a-sliding fit in the smaller chamber;

an expansible," annular combustion chamber in said larger cylinder adjacent its junction with said smaller cylinder, said air supply means comprising a suction operated intake valve in said smaller cylinder adjacent the lower end thereof,

2. In a Diesel monkey including fuel and air supplying means, a pair of alined vertical cylinders, one cylinder having a larger bore than the other, a ram having an enlarged head slidably mounted in the larger chamber and a reduced stem having a sliding fit in the smaller chamber; an expansible, annular combustion chamber. in

- said larger 'cylinder adjacent its junction with said smaller cylinder, said air supply means. comprising a suction operated intake valve in said lower cylinder adjacent the lower end-thereof, said stem being operative to suck air into said smaller chamber through said valve during a portion of the upstroke of said ram, said stem being formed to provide means for delivering air to said combustion chamber'on the downstroke of said ram.

and means for trapping a predetermined amount of said air in said combustion chamber during the latter part of the down stroke of said ram.

3. In a Diesel monkey includin'gfuel and air supplying means, a pair of alined vertical cylinvders, one cylinder having a larger bore than the other, a ram having an enlarged head slidably mounted in the larger chamber and a reduced stem having a sliding fit in the smaller chamber; an expansible, annular combustion chamber in said larger cylinder adjacent its junction with said smaller cylinder, said air supply means sealing means carried .by said smaller cylinder adjacent its junction with said larger cylinder to seal said combustion chamber off from said smaller cylinder.

4. In a Diesel monkey including fuel and air supplying means, a pair of alined vertical cylinders,one cylinder having a larger bore than the other, a ram having an enlarged head slidably mounted in the larger chamber and a reduced stem having a sliding fit in the smaller chamber;

an expansible, annular combustion chamber in said larger cylinder adjacent its junction with said smaller cylinder, said air supply means comprising a suction operated intake valve in said lower cylinder adjacent the lower end thereof,

said stem being'operativ'e to suck air into said smaller chamber through said valve during a por-' tion of the upstroke of said ram, said stem being formed to provide means for delivering air to said combustion chamber on the downstroke of said ram, means for trapping a predetermined amount of said air in said combustion chamber during the latter part of the down stroke of said ram, and a weighted outlet valve adjacent said intake valve, said outlet valve being operative todischarge surplus air from said smaller cylinder only after the trapping of said air in said combustion chamber.

5. In a Diesel monkey including fuel and air supplying means, a "pair of alined vertical cylinders, one cylinder having a larger bore than the other, a ram having an enlarged head slidably mounted in the larger chamber and a reduced stem having a sliding fit in the smaller chamber; an expansible, annular combustion chamber in said larger'cylinder adjacent its junctionwith said smaller cylinder, said air supply means comprising a suction operated valve in said smaller cylinder adjacent the lower end thereof, said stem being operative to suck air into said smaller chamber through said valve during a portion of the upstroke of said ram, said stem being formed to provide passages therethrough for delivering air to said combustion chamber on the downstroke of said ram, said passages being formed to be sealed off from said combustion chamber durair in said combustion chamber.

' PAUL PFEIFF'ER. 

